Machine for dressing millstones



(No Modelz) 2 Sheets-Sheet]. I. B. BAKER.

'MAGHINE FOR DRESSING MILLSTONES. No. 814,776. Patented Mar. 31, 1885.

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UNITED STATES f PATENT rice...

ISAAC BRAYTON BAKER, OF PORTALLEGHENY, PENNSYLVANIA.

MACHINE FOR DRESSING MILLST'QNES.

SPECIFICATION forming part of Letters Patent No. 314,776, dated March 31, 1885.

' Application filed August 30, 1884. (K model.)

TO'LZZZ whom it may concern:

Be it known that I, ISAAC B. BAKER, a citizen of the United States. residing at Port Allegheny, in the county of McKean and State of Pennsylvania, have invented a new and useful Improvement in Machines for Dressing Millstones, of which the following is a specification, reference being bad to the accompanying'drawiugs.

Figure 1 is a perspective view of my improved machine for dressing millstones. Fig. 2 is a side elevation of the machine, showing a portion of the driving mechanism. Fig. 3 is a longitudinal section of the machine. Fig. 4 is a detail view of the cam-wheel, and Fig. 15is a sectional view through the driving-pul- Corresponding parts are indicated by like letters in the several views.

This invention relates to machines for dressing the faces of French burr millstones, the object being to provide a simple and compact machine that will be adapted to crack-face and furrow either right hand or lefthand stones, and so arranged as to be under the complete control of the operator.

The invention consists in certain peculiarities in the construction and combination of the parts of a millstone-dressing machine, as will be hereinafter more fully described, and dis tinctly specified in the claim.

The supporting frame or base of the machine consists of a cross-bar, A, that connects the side bars or rails, B B, on which the carriage is supported. This carriage is composed of side pieces, 0 O, that have a tongue-andgroove connection with the rails B B, so as to slide readily thereon for providing the necessary forward and back adjustment, as will be readily understood. The side pieces, 0 G, of the carriage are connected by a cross-piece, 0 having a rearwardly-proj ecting arm, 0 at the end of which is a depending lug or bearing, a, for a screw-shaft, D, that also has a bearing in a lug, b, at the rear end of an arm, A,which projects back from the connecting cross barA of the main frame. The rear end of the screwshaft Dcarries ahand-wheel, D, by which the shaft is rotated for the purpose of adjusting the carriage forward or back. At the rear end of the carriage are journal-boxes c c, for a rock-shaft, E, to which the handle of the pick tool is connected. This shaft is preferably rectangular in cross-section, and the handle F of the pick or dressing-tool is connected to the shaft by a clip, yoke, or collar, (1, that is socketed to correspond with the contour of said shaft, on which it is arranged to slide freely under the manipulation of the operator. The pick or dressing-tool F is detachably connected by means of a set-screw, c, to a pickhead, F, that is carried by the forward end of the handle F in the usual manner.

To one end of the rock-shaft E is rigidlyse cured an arm, G, that is lifted at intervals by a cam, H, on a grooved wheel, I, which is journaled or pivoted to a suitable bearing on one side of the carriage. By the action 'of the cam H against the arm G the rock-shaft Ereceives a partial rotation at intervals, thereby raising the pick or dressing-tool, so thatin its fall against the face of the millstone the requisite dress will be imparted thereto under the guidance of the operator.

' In order to regulate or increase the intensity of the blows delivered by the pick. or tool F, an adjustable spring, f, may be arranged to exert a downward pressure on the arm G of the rock-shaft. This spring may, however, be dispensed with, as the weight of the pick is ordinarily sufficient to produce the desired impression on the stone. The grooved cam wheel or pulley I is actuated by a belt or cord, 9, that nearly encircles said wheel or pulley, and also passes over pulleys K K on the carriage. From the pulleys K K the belt, cord, or chain 9 passes around guiding-pulleys h ii, that are pivoted in a horizontal position to a ledge, 75, of the rail B at one side of the machine. The belt or cord 9 is then passed through a slot or opening in the rail B, and is extended across the machine and through a slot in the rail B, at the outer side of which it is passed around a driving-pulley, L, that is keyed to the spindle M of the mill or other vertical rotary shaft, one portion of the belt or driving-cord 9 being carried in contact with a guiding-pulley or idler, It, at the inner side of the slotted opening in the rail 13. A belt or cord tightening pulley, N, is pivoted to an arm or bracket, m, that is loosely journaled to the end of the rock-shaft E, and the cord 9 is passed around said pulley, so that the tension can be regulated as required.

.otherwise any vertical rotary shaft may be substituted for said spindle. I

In dressing the under stone power can be conveniently taken from the spindle, as'de scribed; but in order to dress the upper stone orrunner it will be necessary'tounshipj. said stone and support it ina reversed position. ,Any Vertical rotaryishaft can thenflbestepped in the bail of the reversed runner and the pulleyLibe keyed to vsaid shaft. The under side of this pulley L is provided with arim that fits intoa circularopening sfmtmedina horizontal plate, P, which isattachedtmt-he forward partof the rail B. at the .side .of .the

machine. The circular opening, in the 1 plate 1? is made to looselysurround; the milkspindle or other vertical rotary shaft, which thns'forms' apivot on which the machineisrotated, as re quired, whileidressingthesurface otfla mill- :stone.

Themanner o using the mach ne -.t0.crackface or furrow the surface of amillstonawill be vreadily understood by those acquainted with-the art of millstone, dressing -andithere fore neednot be further explained.

It may be remarked that themachineisun-i der the perfect control ofKthe operator, who

stands at the backend andjwith, one hand moves the tool laterallyalong {the rock-shaft E, as required, while with the other hand he adj uststhe forward movement of the carriage or turns the whole machine on its pivotal point.

It is obvious that with this machine the high and'hard spots in the stone can be dressed as much and the low and softv spots as little as may be desired, the requisite dressing being done with great accuracy and ease and without requiring more thanprdinary skill.

Havingthusdescribedmy invention, what I claim as new, and desire to secure by Letters Patent, is

The combination of the supporting base or frame having the plate Pextending from one .of its side rails, the driving-pulley L, fitting andworking looselywithin an opening inthe 5 5 plate, said pulley-.being. adapted .tOib keyed tothe mill-spindle, the sliding-carriagewh'ich is fitted withiatonguefandvgrooveconnection to the base,rockshaft E,Lsliding, arm ,F for the dressing-tool, armG,.attached-toon'e. end

of the rock-shaft, arm m, pivoted alsOgthereto, pulleyrN, onarmm, pulley I, ihavingcam -11, for actuating the rock shaft, .pulley iK, sheavesh and v7c, band 9, .for connecting .the ,.pul1eys,and,screw I), for moving the sliding carriage, all combined and arranged topper- -ate substantially as shown and described.

ln testimony that I claim the foregoing as my own I have hereto affixed my signature in presence, of two witnesses.

ISAAC .BRAYTON BAKER. -Witnesses:

5O. FARR,

B. F. BARTLE. 

